In this section of tutorial we will learn how to use the HashMap with the Iterator interface. We will create an example to display the contents of the hashMap using Iterator

• Java HashMap Iterator is a collection class. It implements the Map interface.
• It keeps the data in the key and value form.
• Java HashMap has no iterator method.
• So use the entrySet() method.It returns the data in Set object form.
• Set's all elements can be traversed by the Iterator.

Java Hashmap Iterator Example

import java.util.*;
public class hashmap1 {
	public static void main(String[] args) {
		HashMap map = new HashMap();
		map.put("a", "Apple");
		map.put("b", "Boy");
		map.put("c", "cat");
		map.put("d", "Dog");
		Set s = map.entrySet();
		Iterator it = s.iterator();
		while (it.hasNext()) {
			System.out.println(it.next());
		}
	}
}

Output

d=Dog b=Boy c=cat a=Apple

Related Tags for Java Hashmap Iterator :